Designed in collaboration with Robert Keeley of Keeley Electronics as a follow-up to the best-selling Custom 10, the Keeley Custom 12 is built to seamlessly integrate your pedals into the heart of an all-tube Supro amplifier. The preamp and 2-band EQ section are voiced perfectly for running your gain pedals in front of the amp, while still maintaining Supro’s signature midrange heft and phenomenal touch dynamics. And a transparent effects loop provides the ideal point to inject your delay and reverb effects into the amplifier’s all-tube signal path, avoiding unwanted distortion on modulation effects. The Keeley Custom 12 features the legendary Celestion G12M-65 Creamback speaker, developed in the mid-1960s and beloved by the biggest guitar players in history. It produces vintage, woody tone while still offering major power, perfect for modern amps. Low-end heft complements warm and vocal midrange, with crunchy upper-mids and sweet, articulate highs. A master volume circuit allows you to control the sound pressure level coming from the speaker, while pouring on copious amounts of gain from the ECC83S-based tube preamp or your favorite dirt pedals.